(Also missile address) The
form used to register a site with the Usenet mapping project, back before
the day of pervasive Internet, included a blank for longitude and latitude,
preferably to seconds-of-arc accuracy. This was actually used for
generating geographically-correct maps of Usenet links on a plotter;
however, it became traditional to refer to this as one's ICBM address or missile address, and some people include it in
their sig block with that name. (A real missile
address would include target elevation.)